Relief shown by hachures. Depths shown by soundings. "N.B. This survey has been taken at different times and reduced to one general scale in the year 1778." In upper right corner: "The property of J.E. Hilegard." "No.2." Available also through the Library of Congress Web site as a raster image. Includes text. Insets: A plan of Manchac 1774 -- A Continuation of the Mississippi ...